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/*
* MacRuby implementation of Ruby 1.9 String.
*
* This file is covered by the Ruby license. See COPYING for more details.
*
* Copyright (C) 2007-2010, Apple Inc. All rights reserved.
* Copyright (C) 1993-2007 Yukihiro Matsumoto
* Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
* Copyright (C) 2000 Information-technology Promotion Agency, Japan
*/

#include "ruby.h"
#include "encoding.h"
#include "unicode/ucnv.h"

// do not forget to close the converter
// before leaving the function
#define USE_CONVERTER(cnv, str) \
assert(str->encoding->private_data != NULL); \
char cnv##_buffer[U_CNV_SAFECLONE_BUFFERSIZE]; \
UErrorCode cnv##_err = U_ZERO_ERROR; \
int32_t cnv##_buffer_size = U_CNV_SAFECLONE_BUFFERSIZE; \
UConverter *cnv = ucnv_safeClone( \
(UConverter *)str->encoding->private_data, \
cnv##_buffer, \
&cnv##_buffer_size, \
&cnv##_err \
); \
ucnv_reset(cnv);

static void
str_ucnv_update_flags(rb_str_t *self)
{
    assert(!str_is_stored_in_uchars(self));

    USE_CONVERTER(cnv, self);

    bool ascii_only = true;
    bool valid_encoding = true;
    bool has_supplementary = false;

    const char *pos = self->data.bytes;
    const char *end = pos + self->length_in_bytes;
    for (;;) {
// iterate through the string one Unicode code point at a time
UErrorCode err = U_ZERO_ERROR;
UChar32 c = ucnv_getNextUChar(cnv, &pos, end, &err);
if (U_FAILURE(err)) {
if (err == U_INDEX_OUTOFBOUNDS_ERROR) {
// end of the string
break;
}
else {
// conversion error
valid_encoding = false;
ascii_only = false;
}
}
else {
if (c > 127) {
ascii_only = false;
if (U_IS_SUPPLEMENTARY(c)) {
has_supplementary = true;
}
}
}
    }

    ucnv_close(cnv);

    str_set_has_supplementary(self, has_supplementary);
    str_set_valid_encoding(self, valid_encoding);
    str_set_ascii_only(self, ascii_only);
}

static void
str_ucnv_make_data_binary(rb_str_t *self)
{
    assert(str_is_stored_in_uchars(self));

    USE_CONVERTER(cnv, self);

    UErrorCode err = U_ZERO_ERROR;
    long capa = UCNV_GET_MAX_BYTES_FOR_STRING(BYTES_TO_UCHARS(
self->length_in_bytes), ucnv_getMaxCharSize(cnv));
    char *buffer = xmalloc(capa);
    const UChar *source_pos = self->data.uchars;
    const UChar *source_end = self->data.uchars
+ BYTES_TO_UCHARS(self->length_in_bytes);
    char *target_pos = buffer;
    char *target_end = buffer + capa;
    ucnv_fromUnicode(cnv, &target_pos, target_end, &source_pos, source_end,
NULL, true, &err);
    // there should never be any conversion error here
    // (if there's one it means some checking has been forgotten before)
    assert(U_SUCCESS(err));

    ucnv_close(cnv);

    str_set_stored_in_uchars(self, false);
    self->capacity_in_bytes = capa;
    self->length_in_bytes = target_pos - buffer;
    GC_WB(&self->data.bytes, buffer);
}

static long
utf16_bytesize_approximation(rb_encoding_t *enc, int bytesize)
{
    long approximation;
    if (UTF16_ENC(enc)) {
approximation = bytesize; // the bytesize in UTF-16 is the same
// whatever the endianness
    }
    else if (UTF32_ENC(enc)) {
// the bytesize in UTF-16 is nearly half of the bytesize in UTF-32
// (if there characters not in the BMP it's a bit more though)
approximation = bytesize / 2;
    }
    else {
// take a quite large size to not have to reallocate
approximation = bytesize * 2;
    }

    if (ODD_NUMBER(approximation)) {
// the size must be an even number
++approximation;
    }

    return approximation;
}

static bool
str_ucnv_try_making_data_uchars(rb_str_t *self)
{
    assert(!str_is_stored_in_uchars(self));

    USE_CONVERTER(cnv, self);

    long capa = utf16_bytesize_approximation(self->encoding,
self->length_in_bytes);
    const char *source_pos = self->data.bytes;
    const char *source_end = self->data.bytes + self->length_in_bytes;
    UChar *buffer = xmalloc(capa);
    UChar *target_pos = buffer;
    UErrorCode err = U_ZERO_ERROR;
    for (;;) {
UChar *target_end = buffer + BYTES_TO_UCHARS(capa);
err = U_ZERO_ERROR;
ucnv_toUnicode(cnv, &target_pos, target_end, &source_pos, source_end,
NULL, true, &err);
if (err == U_BUFFER_OVERFLOW_ERROR) {
long index = target_pos - buffer;
capa *= 2; // double the buffer's size
buffer = xrealloc(buffer, capa);
target_pos = buffer + index;
}
else {
break;
}
    }

    ucnv_close(cnv);

    if (U_SUCCESS(err)) {
str_set_valid_encoding(self, true);
str_set_stored_in_uchars(self, true);
self->capacity_in_bytes = capa;
self->length_in_bytes = UCHARS_TO_BYTES(target_pos - buffer);
GC_WB(&self->data.uchars, buffer);
return true;
    }
    else {
str_set_valid_encoding(self, false);
return false;
    }
}

static long
str_ucnv_length(rb_str_t *self, bool ucs2_mode)
{
    assert(!str_is_stored_in_uchars(self));

    USE_CONVERTER(cnv, self);

    const char *pos = self->data.bytes;
    const char *end = pos + self->length_in_bytes;
    long len = 0;
    bool valid_encoding = true;
    for (;;) {
const char *character_start_pos = pos;
// iterate through the string one Unicode code point at a time
UErrorCode err = U_ZERO_ERROR;
UChar32 c = ucnv_getNextUChar(cnv, &pos, end, &err);
if (err == U_INDEX_OUTOFBOUNDS_ERROR) {
// end of the string
break;
}
else if (U_FAILURE(err)) {
valid_encoding = false;
long min_char_size = self->encoding->min_char_size;
long converted_width = pos - character_start_pos;
len += div_round_up(converted_width, min_char_size);
}
else {
if (ucs2_mode && !U_IS_BMP(c)) {
len += 2;
}
else {
++len;
}
}
    }

    ucnv_close(cnv);

    str_set_valid_encoding(self, valid_encoding);

    return len;
}

#define STACK_BUFFER_SIZE 1024
static long
str_ucnv_bytesize(rb_str_t *self)
{
    assert(str_is_stored_in_uchars(self));

    // for strings stored in UTF-16 for which the Ruby encoding is not UTF-16,
    // we have to convert back the string in its original encoding to get the
    // length in bytes
    USE_CONVERTER(cnv, self);

    UErrorCode err = U_ZERO_ERROR;

    long len = 0;
    char buffer[STACK_BUFFER_SIZE];
    const UChar *source_pos = self->data.uchars;
    const UChar *source_end = self->data.uchars + BYTES_TO_UCHARS(
self->length_in_bytes);
    char *target_end = buffer + STACK_BUFFER_SIZE;
    for (;;) {
err = U_ZERO_ERROR;
char *target_pos = buffer;
ucnv_fromUnicode(cnv, &target_pos, target_end, &source_pos, source_end,
NULL, true, &err);
len += target_pos - buffer;
if (err != U_BUFFER_OVERFLOW_ERROR) {
// if the convertion failed, a check was missing somewhere
assert(U_SUCCESS(err));
break;
}
    }

    ucnv_close(cnv);
    return len;
}

static character_boundaries_t
str_ucnv_get_character_boundaries(rb_str_t *self, long index, bool ucs2_mode)
{
    assert(!str_is_stored_in_uchars(self));

    character_boundaries_t boundaries = {-1, -1};

    if (index < 0) {
// calculating the length is slow but we don't have much choice
index += str_ucnv_length(self, ucs2_mode);
if (index < 0) {
return boundaries;
}
    }

    // the code has many similarities with str_length
    USE_CONVERTER(cnv, self);

    const char *pos = self->data.bytes;
    const char *end = pos + self->length_in_bytes;
    long current_index = 0;
    for (;;) {
const char *character_start_pos = pos;
// iterate through the string one Unicode code point at a time
// (we dont care what the character is or if it's valid or not)
UErrorCode err = U_ZERO_ERROR;
UChar32 c = ucnv_getNextUChar(cnv, &pos, end, &err);
if (err == U_INDEX_OUTOFBOUNDS_ERROR) {
// end of the string
break;
}
long offset_in_bytes = character_start_pos - self->data.bytes;
long converted_width = pos - character_start_pos;
if (U_FAILURE(err)) {
long min_char_size = self->encoding->min_char_size;
// division of converted_width by min_char_size rounded up
long diff = div_round_up(converted_width, min_char_size);
long length_in_bytes;
if (current_index == index) {
if (min_char_size > converted_width) {
length_in_bytes = converted_width;
}
else {
length_in_bytes = min_char_size;
}
boundaries.start_offset_in_bytes = offset_in_bytes;
boundaries.end_offset_in_bytes =
boundaries.start_offset_in_bytes + length_in_bytes;
break;
}
else if (current_index + diff > index) {
long adjusted_offset = offset_in_bytes + (index
- current_index) * min_char_size;
if (adjusted_offset + min_char_size > offset_in_bytes
+ converted_width) {
length_in_bytes = offset_in_bytes + converted_width
- adjusted_offset;
}
else {
length_in_bytes = min_char_size;
}
boundaries.start_offset_in_bytes = adjusted_offset;
boundaries.end_offset_in_bytes =
boundaries.start_offset_in_bytes + length_in_bytes;
break;
}
current_index += diff;
}
else {
if (ucs2_mode && !U_IS_BMP(c)) {
// you cannot cut a surrogate in an encoding that is not UTF-16
if (current_index == index) {
boundaries.start_offset_in_bytes = offset_in_bytes;
break;
}
else if (current_index+1 == index) {
boundaries.end_offset_in_bytes = offset_in_bytes
+ converted_width;
break;
}
++current_index;
}

if (current_index == index) {
boundaries.start_offset_in_bytes = offset_in_bytes;
boundaries.end_offset_in_bytes =
boundaries.start_offset_in_bytes + converted_width;
break;
}

++current_index;
}
    }

    ucnv_close(cnv);

    return boundaries;
}

static long
str_ucnv_offset_in_bytes_to_index(rb_str_t *self, long offset_in_bytes,
bool ucs2_mode)
{
    assert(!str_is_stored_in_uchars(self));

    // the code has many similarities with str_length
    USE_CONVERTER(cnv, self);

    const char *current_position = self->data.bytes;
    const char *searched_position = current_position + offset_in_bytes;
    const char *end = current_position + self->length_in_bytes;
    long index = 0;
    for (;;) {
const char *character_start_position = current_position;
// iterate through the string one Unicode code point at a time
UErrorCode err = U_ZERO_ERROR;
UChar32 c = ucnv_getNextUChar(cnv, &current_position, end, &err);
if (err == U_INDEX_OUTOFBOUNDS_ERROR) {
// end of the string
// should not happen because str_offset_in_bytes_to_index
// checks before that offset_in_bytes is inferior to the length
// in bytes
abort();
}
else if (U_FAILURE(err)) {
long min_char_size = self->encoding->min_char_size;
long converted_width = current_position - character_start_position;
long to_add = div_round_up(converted_width, min_char_size);
if (searched_position < character_start_position + to_add) {
long difference = searched_position - character_start_position;
index += (difference / min_char_size);
break;
}
index += to_add;
}
else {
if (searched_position < current_position) {
break;
}
if (ucs2_mode && !U_IS_BMP(c)) {
index += 2;
}
else {
++index;
}
}
if (searched_position == current_position) {
break;
}
    }

    ucnv_close(cnv);

    return index;
}

void
enc_init_ucnv_encoding(rb_encoding_t *encoding)
{
    // create the ICU converter
    UErrorCode err = U_ZERO_ERROR;
    UConverter *converter = ucnv_open(encoding->public_name, &err);
    if (!U_SUCCESS(err) || (converter == NULL)) {
fprintf(stderr, "Couldn't create the encoder for %s\n",
encoding->public_name);
abort();
    }
    // stop the conversion when the conversion failed
    err = U_ZERO_ERROR;
    ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_STOP, NULL, NULL, NULL,
&err);
    err = U_ZERO_ERROR;
    ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_STOP, NULL, NULL,
NULL, &err);

    // fill the fields not filled yet
    encoding->private_data = converter;
    encoding->methods.update_flags = str_ucnv_update_flags;
    encoding->methods.make_data_binary = str_ucnv_make_data_binary;
    encoding->methods.try_making_data_uchars = str_ucnv_try_making_data_uchars;
    encoding->methods.length = str_ucnv_length;
    encoding->methods.bytesize = str_ucnv_bytesize;
    encoding->methods.get_character_boundaries =
str_ucnv_get_character_boundaries;
    encoding->methods.offset_in_bytes_to_index =
str_ucnv_offset_in_bytes_to_index;
}
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